ESNR Stenosis-Urra.pdf · Multiple pathogenic factors: endothelial dysfunction inflammatory and immunologic factors plaque rupture traditional risk factors PATHOPHYSIOLOGY In-situ
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Atherosclerosis: pathologic process thatcauses disease of the arteries.
Most common cause of in situ local diseasewithin the supraaortic arteries and intracranialarteries.
Chronic disease:childhood: fatty streaksfibrous plaquesfibrous capsadvanced atheromatous lesions
Multiple pathogenic factors:endothelial dysfunctioninflammatory and immunologic factorsplaque rupturetraditional risk factors
PATHOPHYSIOLOGY
In-situ thromboembolism:local thrombosis, embolism (multiple cortical infarcts)
Progression of luminal stenosis:hemodynamic insufficiency (watershed infarct)
Branch atheromatous disease:small vessel occlusion (single deep infarct)
PATHOPHYSIOLOGY: STROKE MECHANISMS EPIDEMIOLOGYCommon cause of ischemic stroke
50% in Asia, most common worldwide?Whites: 5 - 10%. Higher in hispanics (x4), blacks (x5), Asians (x6)Underdiagnosis of non-stenosing plaques
Genetic susceptibilityVs.
Differences in lifestyle and risk factors
HypertensionDyslipidemia *severe stenosisDiabetes *carotidAge *basilarMetabolic syndromeSedentarismSmoking
*MCA: women, blacks
RISK FACTORSRisk factors more prevalent than in other stroke subtypes Noninvasive neurovascular imaging
CTA, MRA, TCDBetter NPV than PPVLimitations:
occlusion vs. pseudo-occlusionoverestimate severity of stenosis
Catheter angiography (1% complications)Advantages:
accurate measurement of the degree of stenosisdifferentiation of occlusion vs. pseudo-occlusionassessment of collateral flow patterns
Indications:The added information is unlikely to alter management. I ti t lt ti ti l i di ti liti
DIAGNOSIS
Is thisaterosclerosis?
High-resolution vessel wall imagingIs this
aterosclerosis?
Clinicalpresentation
Less common conditions
Dissection: less frequent than extracranial dissections. String sign, tapered/flame-shaped occlusion, intimal flap, dissecting aneurysm, distal pouchIntramural hematoma in fat-saturated MRI
Primary angiitis CNS: rarePresentation: insidious, headache, cognitive impairment, and multiple infarcts in different
vascular territories. ”String of beads" in smaller distal intracranial vessels.
Reversible cerebral vasoconstriction syndrome: Thunderclap headache
Fibromuscular displasia: most frequently involves the renal and internal carotid and vertebral arteries.
Moyamoya: bilateral stenoses affecting the distal internal carotid arteries and prominent collateralvessels.
DIFFERENTIAL DIAGNOSISHigh risk of stroke, especially in symptomatic cases (up to 25% anual risk in WASID)
Lower with intensive medical therapy (SAMMPRIS 12%)
Subgroups with high risk of stroke:Degree stenosis: severe (≥70%) HR 2Hypoperfusion (“hemodynamic stenosis”) Recent ischemic symptomsPresentation with stroke (vs. TIA)Old infarct in the territory of the stenosisWomenAbsence of statin at trial entry
PROGNOSIS
TREATMENTMaximal medical therapy: association between good control of risk factors and lower risk of events
Antiplatelets: dual antiplatelet for 3 weeks – 3 months (CHANCE subgroup analysis)
ticagrelor in clopidogrel resistants?Intensive control of vascular risk factors:
Antihypertensive agents: the majority of patients benefit from SBP <140 (WASID, SAMMPRISS)
Statins: target LDL-C <70 mg/dLLifestyle modification: exercise
smoking cessationweight reductionhealthy diet: mediterranean diet (Estruch et al NEJM 2013)
Interventions:EC-IC bypassStenting
SAMMPRISVISSIT
y
Atherosclerotic stenosis of the major intracranial arteries is a commoncause of ischemic stroke, especially in blacks, Asians, and Hispanics
Diagnosis usually made with noninvasive imaging
Differential diagnosis includes other less common types of intracranialvasculopathies
The anual risk of stroke is high, especially in patients with severe stenosis
Despite this, the primary treatment is based in MAXIMAL medical therapy that includes antiplatelet and antihypertensive agents, statins, and lifestyle modifications
TAKE-HOME MESSAGES
Thank you
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